Device and method for detecting defect of corrugated cardboard sheet

摘要

Problem to be solved: to provide a defect detecting apparatus for a corrugated cardboard sheet capable of improving the detection accuracy of wrinkle defects on the surface of the corrugated cardboard sheet.A defect detection device according to the present invention isVisible light sourceNon visible light sourceA visible light image acquisition part which acquires visible light image by capturing a surface with visible light andA non visible light image acquisition part which acquires non visible light image by imaging a surface with non visible light andVisible light differential processing unit which generates visible light differential image data by differentiating visible light image andNon visible light differential processing unit which generates non visible light differential image data by differentiating non visible light image andA subtraction processing unit which generates subtraction value image data by subtraction processing of non visible light differential image data and visible light differential image data andSubtraction value image dataIf the absolute value contains a subtraction value that is greater than or equal to a given thresholdA determination section for judging that the wrinkle defect exists on the surface andIs provided.Diagram